Compound / recurring-buy estimator
Compounding only shows its effect over a long stretch. Set a principal, how much you're willing to add each month, and a fixed APR, then see roughly what order of magnitude you'd be looking at after a number of years. Note: this is only a demonstration that assumes the rate stays fixed. In reality, rates move and coin prices swing, so don't treat it as a promise.
Estimated with monthly compounding and a top-up at the start of each month; a constant rate never holds in reality, so this is only for a feel of the scale of compounding.
Before locking all your money into a single product long-term to chase compounding, think through the liquidity and coin-price risk. Compounding is a slow-moving variable; don't throw your emergency money in for an extra point or two. For the mechanics, see the difference between APR and APY.